| Reading to Olivares | 1,002.32 mi (1,613.07 km) |
| Reading to Olivenza | 930.68 mi (1,497.79 km) |
| Reading to Olot | 661.02 mi (1,063.80 km) |
| Reading to Onate | 585.72 mi (942.63 km) |
| Reading to Onda | 794.73 mi (1,278.99 km) |
| Reading to Onteniente | 872.97 mi (1,404.90 km) |
| Reading to Orihuela | 923.68 mi (1,486.52 km) |
| Reading to Osuna | 1,003.09 mi (1,614.32 km) |
| Reading to Ourense | 708.27 mi (1,139.85 km) |
| Reading to Oviedo | 603.54 mi (971.30 km) |
| Reading to Paiporta | 831.37 mi (1,337.96 km) |
| Reading to Pajara | 1,735.23 mi (2,792.59 km) |
| Reading to Palafolls | 698.60 mi (1,124.28 km) |
| Reading to Palafrugell | 687.19 mi (1,105.92 km) |
| Reading to Palamos | 691.51 mi (1,112.88 km) |
